Timing Chain and Sprocket Installation (LS7)

Special Tools

• EN-47812  Installer Bolt
• J 41665  Crankshaft Balancer and Sprocket Installer

For equivalent regional tools, refer to Special Tools

Fig 1: View Of Crankshaft Key & Keyway
Courtesy of GENERAL MOTORS COMPANY
1. Install the key into the crankshaft keyway, if previously removed.
Fig 2: View Of Installed Crankshaft Key
Courtesy of GENERAL MOTORS COMPANY
2. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.
Fig 3: View Of Crankshaft Sprocket
Courtesy of GENERAL MOTORS COMPANY
3. Install the crankshaft sprocket (207) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.
Fig 4: Installing Crankshaft Sprocket
Courtesy of GENERAL MOTORS COMPANY
4. Use the EN-47812  bolt (1) and the J 41665  installer (2) in order to install the crankshaft sprocket.

   Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

5. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.
Fig 5: Timing Chain Dampener & Bolts
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

6. Install the timing chain dampener (232) and bolts (231) and tighten bolts to 25 N.m (18 lb ft).
Fig 6: Crankshaft Gear & Timing Chain
Courtesy of GENERAL MOTORS COMPANY
NOTE:
• Properly locate the camshaft sprocket onto the locating pin of the camshaft.
• The sprocket teeth and timing chain must mesh.
• The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

  Position the camshaft sprocket alignment mark in the 6 o'clock position.

• For assembly, the fastener threads, sprocket face, and camshaft bolt holes must be clean, dry, and free of oil.
7. Install the camshaft sprocket (205) and timing chain (208). If necessary, rotate the camshaft or crankshaft sprockets in order to align the timing marks.
Fig 7: Aligning Sprockets
Courtesy of GENERAL MOTORS COMPANY
8. Inspect the sprockets for proper alignment. The mark on the camshaft sprocket (1) should be located in the 6 o'clock position and the mark on the crankshaft sprocket (2) should be located in the 12 o'clock position.
CAUTION:

Refer to Fastener Caution .

9. Install the camshaft sprocket bolts and tighten to 25 N.m (18 lb ft).